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Walker 285-1121 Nitrogen Oxide (NOx) Sensor - Upstream
| Brand | Walker 285-1121 |
|---|---|
| Position | Upstream |
| Color | Gray |
| Finish | Matte |
| Connector Color | Gray |
| Terminal Type | Spade |
| Connector Shape | Square |
| Terminal Quantity | 4 |
| Connector Gender | Female |
| Terminal Gender | Male |
| Product line | Genuine OE |
| Fits | Nissan · 4 vehicles |
Genuine OE line. Walker Products uses OE-level materials and precision manufacturing standards.
Plug-and-play fit. OE connectors and harness length simplify replacement on the original setup.
SCR system monitoring. Accurate NOx measurement supports proper aftertreatment performance.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Overview
Walker Genuine OE NOx Sensor part number 285-1121 is built for emission systems that rely on accurate nitrogen oxide monitoring. It is a direct-fit sensor with OE-style connectors and harness length for a clean replacement on the specified application.
Key Features
- Genuine OE line from Walker Products
- NOx sensor for SCR emission system monitoring
- OE connectors and harness length for plug-and-play installation
- Gray matte finish with square connector design
- 4-terminal layout with female connector and male spade terminals
Product Details
Walker Products 285-1121 is a Genuine OE nitrogen oxide sensor engineered for precise exhaust aftertreatment monitoring. Accurate NOx measurement supports SCR system performance and helps protect downstream emission components by giving the control system the data it needs to manage exhaust treatment correctly. The gray connector housing, square connector shape, and OE-style electrical interface reflect the sensor’s direct-replacement design.
This part cross-references no listed interchange numbers for the same application. For buyers searching by vehicle, this sensor fits 2016-2019 Nissan TITAN XD, upstream. It is a strong match for Nissan TITAN XD emission repair work where the original NOx sensor has failed or is reporting inaccurate readings. Part number 285-1121 is also useful when confirming the correct Walker replacement before ordering.
What It Helps Address
- NOx sensor fault codes related to exhaust aftertreatment monitoring
- Incorrect nitrogen oxide readings in SCR-equipped systems
- Emission system performance issues caused by a failed upstream sensor
- Reduced efficiency in diesel exhaust aftertreatment control
- Replacement needs for a damaged OE-style sensor connector or harness interface
Installation Notes
Fits 2016-2019 Nissan TITAN XD, upstream. Verify connector shape, terminal layout, and harness routing before installation. Use the OE connector and harness length as reference points when comparing the replacement sensor to the original unit. Part number 285-1121 should be matched to the vehicle’s emission system configuration before installation.
Quality Assurance
Walker Products states that its Genuine OE NOx Sensors are produced by Tier 1 OE suppliers using high-quality materials and precision manufacturing standards. The design is intended to deliver dependable performance in heat, vibration, and corrosive exhaust environments.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2019 | Nissan | TITAN XD | 5.0L | V8 | Upstream | Genuine OE |
| 2018 | Nissan | TITAN XD | 5.0L | V8 | Upstream | Genuine OE |
| 2017 | Nissan | TITAN XD | 5.0L | V8 | Upstream | Genuine OE |
| 2016 | Nissan | TITAN XD | 5.0L | V8 | Upstream | Genuine OE |
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